Island



. G. W. DOVER. METHOD OF MAKING FALSETEETH BACKINGS FROM SHEET METAL.

APPLICATION FILED MAY 23, 1918.

1 5 ii Ifr. ,5 3?: Q

P555 8 fig". ,9 g- 10 If 11 22 5 12 Fig-.13

a 1+ 14* /6 fis 1e 1 17 r 1'? :24 17 14 25 15 15 26 IE 16 IN g'NZ-UH 2E r IDENEYJ Patent-ed Aug. 19, 1919.

' PATENT OFFICE;-

enonen w tnIAiv'rnovnaor cn ivsrroN; nnonn ISLAND, AssIeNon, BY MESNE ASSIGNMENTS,- T0 nlyrunloan UARANTEED "roo'rn COMPANY, I'ncocaronn'rnn, or BosaoN, a'ssnorrusnrrs, A coaroRA'rIoN or MASSACHUSETTS.

un rnonor M-n I ve FALSE TEETI-I BACKING-S FROM S E T reefier ne e e t t. n ed A g- 19 19 App1ic a. t i o 1 1 filedilriay as, 1918. Serial No. 236,202.

To all whomit mayconoerm.

Be it known that. I, .GEORGE. W Lnm Dovnn, a. citizenof the Unitedss tates res i d;- ing atCranston, in the county of Providence andHState of Rhode; Island, have invented a new anduseful Improvement Methods of Making False-Teeth Backings from Sheet Metal,' of which the following is speci; e i ll- In false teeth backings, formed fronisheet metal, such as shown in United States Patents Nos. 377,248, and 1,159,309, the sheet I metal is bent up. so as to form a tube with wings at each side of the tube. This con struotion leaves aline of separation between the wings or plates and such backings as a whole are crude and weak in construction.

The object of my invention is. to. improve the method of making backings of: sheet metal for; porcelain teeth, said backing, which consists principally of a plate which lays against the inner face of the toothand a central pin on. the back of the plate which enters the tooth, the: whole being solid ,in construction, like a casting, but stronger and more rigid than a casting, by the sheet metal being compressed-in thevarious operat ons in forming up the backing. I

Another object of my invention in improving the method of making false teeth backingsof sheetmetal is, to split the back ing blank through its thickness, and to roll the split portions over and outward at each side, so as to form the plate of the backing out of the split portions of the blank.

My invention consists in the peculiar and novel method of making false teeth backings of sheet metal, as will be more fully set forth hereinafter and claimed. I

Figure 1 is a side view of a. sheet metal blank from which a false tooth. backing is formed. Y

Fig. 2 is an edge view of the blank.

Fig." 3' is a longitudinal jsectionalwlew throughthe essential portion of a; splitting die, showing a side view of the blankin the position tobe split.

i Fig. 4 is a transverse sectional view through the splitting die showing. an end view of the'blank in the position to be split.

Fig. 5; is a transverse sectional view similar to 1Fig. 4; with the die closed and the blank sp t.

Fig. .6 is a transverse sectional view through open dies that flatten out the split and rolled over portions of the blank.

F 7 is a sectional view similar to Gshowihgthe flattening dies closed'and the split portions of thebl ank flattened out to form the transverse plate ofthe backing.

. Figs. 8, 9, and 10 are side',end and. back i a views respectively, showing the formation of the central round pin on the transverse plate. Figs: '11, 12 and 13 are side, end-and back views respectively, showing the-bending of the pin toward the plate, and.

Figs. 1'4, 15 and 16. are side, end and back I 7 views respectively showingthebending of a portion of the plate parallel .with the pin, thereby completing the final step in forming the tooth backing from sheet metal;

All of the figures are enlarged to more clearly show my invention.

In the drawings 1 indicates a blank struck from sheet metal by suitable dies and shaped to have a. flat body 2 from which extends at an angle a ste1n8 as shown in Fig. 4L a lower splitting die member in the form of a plate the same thickness the blank tobe split and having an opening 5. in its. upper edge shaped to receive the stem portion of the blank l as shown in Fig; 3. Anlupper splitting die member 6 carries a'oentral splitting cutter 7 and separable bars 8.8. ateach side of the lower die 'member 4, therinner top edges of the bars being on a line with the cutting edge ofthe splitting cutter 7 as shown in Fig. 4. The upper dle member 6 also has above the bars 8. 8,'a recess 9 with a flat bottom, at each side of the cutter. Lower "and upper flattening die members 10 and 11, the upper die member the t e h from sheet metal consists in striking out by suitable dies, a blank having a comparatively thin flat body 2 and an angular stem 3, as shown in Fig.- 1, from sheet metal, placing the blank edgewise in a split tin die as shown in .3, said die having removable bars .8. 8 so as to hold the sides of the blank, at the point of splitting, as the blank is being split down, closing the splitting dies and splitting a predetermined portion of the blank body 2 through its thickness,:tl1e split portions 13.13 of the blank striking the flat bottom of the recesses 9. 9 in the upper die member 6 androlling over oneach side, as shown in Fig. 5 and the inner top edge of the bars 8. 8 holdinggeach side ofthe blank at the point where it is being split and simultaneously following down with the splitting cutter 7, placing the split blank in the flattening die members 10 and 11 andclosing the die, thereby forming v a fflat transverse plate 14 on the blank, as

shown in Fig. 7 forming a round pin 15 out ofv the stem 3 which has a larger round:

base 16 connecting'the pin to the plate 14', as shown in Figs. -8,, 9 and 10, bending the pin 15 and base16 toward the plate 14 as shown in Figs. 11, 12 and 13, and then bending a portion 17 of the plate lt parallel with the pin 15, as shown in Figs. 14, 15 and 16 thereby completing the tooth backing;

The' principal operation in my improved method of making false teeth backings of sheet metal consists in splitting .the sheet metal blank through its thickness and foreing the split portions over at each side, the split portions of the blank forming the transverse plate for the pin.

p I" By the use of my improved method of forming false teeth backings integral of sheet metal, an extremely strong and, rigid backing is fonned, otherwise a backing of this kind in which the central pin .on the back of the plate is formed integral with the plate, would have to be cast or the pin soldered to the plate, either of which is not asstrong, rigid or durable as the backing made by my improved method. 7

It will be seen that by the method above described, I produce in one piece, a plate having opposite. sides of substantial area, and a stem projecting from one side of the plate and integral therewith, the plate overhanging the. stem in various directions. It will also be seen that theedge portion of the blank from which the stem 3 projects, constitutes a neck-forming portion integral with the stem, and :that the portion of the blank. between said neck-forming portion and'the opposite edge of the blank, constitutes a wing-forming portion adapted to be split to form the oppositely projecting wings 13, integral with the neck. The splitting 7 operation therefore results in the formation of a stemmed plate which includes the said wings and a neck connecting the wings, and overhangs the stem in various directions. A part of the neck-forming portion of the blank at one side of the stem 3, is ofiset or extended to provide material, for an enlarged tenon ortion or head 16, so that provision is ma e for fashioning from a portion of the neck and from the stem 3, a tenon having an enlarged base portion 16, a reduced pin-like portion 15, and a web or neck portion16, (Figs. 11 and 12), said portions lar, ian'd'has no joint or seam, and that the web portion does not comprise layers connected by a'joint orv seam.

The area of the flat sides of the wingforming portion is greater than that of the sides of the solid stem-forming portion, so that in the completed article the plate overhangs the stem in various directions. vBy this I mean-that the 'plate'overhangs the stem both crosswise and lengthwise, so that the base, of the stem is within at least three of the edges of the plate, and preferably within four of said edges.

As shown by the drawings, the stem portion of the blank is inclined relatively to the wing-forming portion, so that in the completed article the pin or tenon is at an inclination to the wings. forming the plate, although a stemmed plate with the stein either perpendicular to or parallel with the plate may be produced with equal facility by the improved method. 7

Although my improved method is particularly adapted for making false teeth backings from sheet metal blanks, it is self-evident that by aslight change in the. structure of the instrumentalities used, any other analogous thing that can be made of sheet metal in this way, may be made by my im-. proved method.

Having 7 thus described my invention I claim as newt l. The method of making false teeth backings from sheet metal consisting in striking out a blank of the required shape andthickness, from sheetmetal, placing the blank edgewis'e in a splitting die and splitting a predetermined portion of the blank through its thickness, and simultaneously holding each side of the blank on'aline with the splitting, as the blank is being split, placness, from sheet metalfplacihg the blank ing, the split blank in flattening diesand flatteningout the split portions of the'blja'nk to form atransverse plate on theblank, and forming the unsplit portion ofthe blank into an, angular central pin on the plate.

"2; The method ofi making false teeth backings from sheet metal consisting in striking out a blank of the required slia'jpe land-thickedgewise in a splitting, die and, splitting a predetermined portion of the blank through its thinn s and.v s mult neously, holding each side of theblankbnaline with the splitting, as the blank is being sp1it,"placing the split blank in flattening dies and flattening out the splitportions of the blank to form a transverse plate onthe blank, and forming the unsplit portion of the blank into an angular central pin and connecting web on the plate. 3. The method of making false teeth backings from sheet metal consisting in striking out a blank of the required shape and thick-, ness, from sheet metal, placing the blank edgewise in a splitting die and splitting a predetermined portion of the blank through its thiclmess, and simultaneously holding each side of the blank, on a line with the splitting, as the blank is being split, placing the split blank in flattening dies and flattening out the split portions of the blank to form a transverse plate on the blank, forming the unsplit portion of the blank into an angular central pin on the plate and bending a portion of the plate down parallel with the in.

4. The method of making false teeth backings from sheet metal consisting in striking out a sheet metal blank having a comparatively thin flat body portion and a stem at an angle to the body portion, placing the.

blank edgewise in a splitting die and simultaneously splitting the body of the blank through its thickness a predetermined distance, rolling the split portions over and outward and simultaneously holding the sides of the blank at the line of splitting, as the blank is being-split, flattening the split and rolled over portions of the blank into a flat plate in suitable flattening dies,

forming the stem on the blank into a central angular round pin on the back of the plate, bending the pin down toward the plate and bending a portion of the plate parallel with the pin. M

5. The improvement in the method of making seamlessstemmed plates, which consists in striking out from sheet metal a flatsided blank having a wing-forming portion and a solid stem-forming portion, the area of the sides of the wing-forming portion being greater than that of the sides of the stem-forming portion, and splitting and bending a part of said blank to form oppositely projecting wings integral with each other, said wings overhanging the stem in various" directions and being in tegral with the stcmi. I v '6; The improvement 'intl'leinethod of marking seamless= stemmed plates which conf siists iii? striking out: fronr sheet metal a flatslded blank having a wing-forming portion and a 'solid stem-forming portion, inclined relatively to the win-g forniing portion, the

oppositely projecting wings integral with each other, said wings overhanging the stem in various directionsand being integral with the stem.

7. That improvement in the method of making seamless stemmed plates which consists in striking out from sheet metal a flatsided blank having a wing-forming portion, a neck-forming portion, and a solid stem projecting from the neck-forming portion, the area of the sides of the wing-forming portion being greater than, that of the sides of the neclofor'ming portion, and splitting and bending a part of said blank to form oppositely projecting wings integral with each other, and a neck integral with and connecting the wings, said neck and wings constituting a seamless plate which over hangs the stem in various directions, and is integral with the stem.

7 8. That improvement in the method of making seamless tenoned backings for false teeth, which consists in striking out from sheet metal a flat-sided blank having a wing-forming portion, a neck-forming portion, and a solid stem projecting from the neck-forming portion and inclined relatively thereto, the area of the sides of the wingforming portion being greater than that of the sides of the neck-forming portion, splitting and bending a part of said blank to form oppositely projecting wings integral with each other, and a neck integral with and connecting said wings, said neck and wings constituting a seamless plate which overhangs the stem in various directions, and is integral with the stem, forming said plate into an operative tooth backing, and forming said stem into an operative solid and seamless tenon adapted to engage a socket in a tooth body.

9. That improvement in the method of making seamless tenoned backings for false teeth, which consists in striking out from sheet metal a flat-sided blank having a wingforming portion, a neck-forming portion, and a solid stem projecting from the neck-forming portion and inclined relatively thereto, the area of the sides of than that of the sides of the neckforming portion, a part of said neck- -forming portion being offset at one side of the stem to provide material for a tenon head, splitting and bending apart of said 5 blank to form oppositely projecting wings integral with each other, and a neck integral with and connecting said wings, said neck and Wings constituting a seamless plate which overhangs the stem in Various 10 directions and is integral with the stem, forming said plate into an operative tooth 1 GEORGE WILLIAM novnn,

Copies cit this patent may be obtained for five cents eachfoy addressing the vffqolninissionei' of Iaten ts,

Washington, 1:. c. 

